NEW YORK — Alex Rodriguez has another walk-off to go along with the 11 game-ending hits in his big league career.

The New York Yankees star walked out in the middle of a session Wednesday, furious that arbitrator Fredric Horowitz refused to order baseball Commissioner Bud Selig to testify. The move, followed by angry statements accusing Selig of bias and the entire arbitration process of flaws, appeared to be a prelude to a lawsuit challenging whatever ruling Horowitz makes on A-Rod’s 211-game suspension.

Horowitz was in the midst of the 11th day of hearings on the grievance filed by the players’ association to overturn the penalty given to the three-time AL MVP by Major League Baseball in August for alleged violations of the sport’s drug agreement and labor contract.

“I lost my mind. I banged a table and kicked a briefcase and slammed out of the room,” Rodriguez said during a 40-minute interview on WFAN radio. “I probably overreacted, but it came from the heart.”

Rodriguez has not testified in the grievance and said he had been warned that repeating his denials of wrongdoing on the stand could result in attempts at additional discipline by MLB.

Rodriguez and the union asked Horowitz to compel Selig to testify. After the arbitrator refused, Rodriguez uttered a profanity at Manfred just before leaving the hearing room at MLB’s office.